Refactoring: THROW_FILE_SKIPPED --> ThrowFileSkipped; THROW_SCP_ERROR --> ThrowScpEror
ScpFileSystem.cpp: Minor code style fix.
Refactoring: inline void SCPError
SftpFileSystem.cpp: Fix cppcheck warning.
SftpFileSystem.cpp: Fix cppcheck warning:  Variable 'LocalFileHandle' is assigned a value that is never used.
SftpFileSystem.cpp: Fix cppcheck warnings: The scope of the variable can be reduced.
SftpFileSystem.cpp: Fix file handle manipulations.
ScpFileSystem.cpp: Fix file handle manipulations.
TStringList::ExchangeItems: Cleanup.
Minor code style fixes.
Refactoring: ::UnixExtractFilePath